Ultravox vs Vapi: Which Is Better for Your Team in 2026?
Ultravox and Vapi are both used for ai voice agents. Below we compare them on pricing, AI capabilities, compliance, and the use cases each one fits best — all from verified vendor data.
Choose Ultravox if…
- Developer teams building voice agents who want to eliminate the 3-stage ASR→LLM→TTS pipeline overhead
- Open-source-first engineering teams who want to evaluate or self-host the model weights before committing to the managed API
- Startups needing a fast path to PSTN voice agents with built-in Twilio/Telnyx/Plivo and no infrastructure work
- Teams building on Pipecat or LiveKit who want a drop-in speech-to-speech service with the best benchmark scores
Choose Vapi if…
- Engineering teams that want total control over LLM, voice, and telephony stack
- Startups building voice AI products on top of Vapi's infrastructure layer
- Regulated-industry deployments (healthcare, finserv) needing HIPAA + SOC 2 + BAA
- High-customization use cases: custom LLM fine-tunes, proprietary TTS voices
Ultravox vs Vapi: feature comparison
| Feature | Ultravox | Vapi |
|---|---|---|
| At a glance | ||
| Category | AI voice agent platform | AI voice agent platform |
| Best fit | Smb, Mid market, Enterprise | Smb, Mid market, Enterprise |
| Deployment | Cloud, Self hosted | Cloud, Private cloud |
| Channels | Voice | Voice, SMS |
| Pricing & ratings | ||
| Starting price | From $0.05/min | From $0.05/min |
| Free trial | No | No |
| User rating | — | — |
| AI capabilities | ||
| Autonomous voice agent | Yes | Yes |
| Real-time agent assist | No | No |
| Conversation intelligence | No | No |
| Automated QA | No | No |
| Intelligent routing | No | Yes |
| Compliance | ||
| SOC 2 Type II | No | Yes |
| HIPAA | No | Yes |
| PCI DSS | No | Yes |
| GDPR | No | Yes |
Ultravox vs Vapi: frequently asked questions
- What is the difference between Ultravox and Vapi?
- Speech-native LLM with a managed API — Ultravox v0.7 (GLM 4.6) skips ASR and TTS stages entirely. #1 on VoiceBench. Developer-only; no no-code builder; compliance certs unconfirmed. By contrast, Maximum configurability for engineers: BYO everything, 9+ LLM providers, 10+ TTS providers. The tradeoff is real — non-engineers will hit a wall fast.
- Is Ultravox or Vapi cheaper?
- Ultravox starts at $0.05/min and Vapi starts at $0.05/min. Compare the full pricing breakdown above, since seat minimums and add-ons affect total cost.